How severe is CVE-2026-33638?

CVE-2026-33638 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-33638 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33638?

CVE-2026-33638 affects Ech0. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33638?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33638 have an EU (EUVD) identifier?

Yes. CVE-2026-33638 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16413.

When was CVE-2026-33638 published?

CVE-2026-33638 was published on 2026-03-26 and last updated on 2026-06-17.

CVE-2026-33638

CVE-2026-33638 is a medium-severity vulnerability in Ech0 with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16413
Weakness: CWE-862
Affected product: Ech0
Published: 2026-03-26
Last modified: 2026-06-17

Description

Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to version 4.2.0, `GET /api/allusers` is mounted as a public endpoint and returns user records without authentication. This allows remote unauthenticated user enumeration and exposure of user profile metadata. A fix is available in v4.2.0.

Frequently asked questions

What is CVE-2026-33638?: Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to version 4.2.0, `GET /api/allusers` is mounted as a public endpoint and returns user records without authentication. This allows remote unauthenticated user enumeration and exposure of user profile metadata. A fix is available in v4.2.0.
How severe is CVE-2026-33638?: CVE-2026-33638 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-33638 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33638?: CVE-2026-33638 affects Ech0. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33638?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33638 have an EU (EUVD) identifier?: Yes. CVE-2026-33638 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16413.
When was CVE-2026-33638 published?: CVE-2026-33638 was published on 2026-03-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ech0:ech0:*:*:*:*:*:*:*:*

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